Is power the same as power consumption? The difference between power and power

The literal meaning is not the same, power consumption refers to the power consumption per unit time, the actual refers to the power, the power consumption refers to how many points are used, that is, how much electricity we usually use

Power consumption is the loss of power, which refers to the difference between input power and output power of equipment and devices. Sometimes it refers to the power required by the whole machine or equipment.

Power consumption = input power - output power; when the power required by the whole machine is used, power consumption = input power. That is to say, when it is worn out, the power consumption is the power consumed by the entire device minus the output power of the device. Refers to the power consumed by the whole machine when it is consumed. Its unit is still watt, not a unit.

Definition 1: Power loss refers to the difference between input power and output power of equipment and devices. Power loss. The heat energy dissipated on the device and the device is usually referred to in the circuit.

Definition 2: Power consumption is also an indicator of all electrical equipment, which refers to the amount of energy consumed per unit of time, in W. The circuit refers to the power required by the whole machine or equipment. However, unlike copiers, copiers do not always work. They are in standby when they are not working. They also consume a certain amount of energy (unless they are powered off, they do not consume energy). Therefore, the power consumption of the copier is generally two, one is the power consumption during operation, and the other is the power consumption during standby.

Power refers to the amount of work done by an object in a unit of time, that is, the power is a physical quantity that describes the speed at which work is done. The amount of work is constant, and the shorter the time, the greater the power value. The formula for finding power is power = work / time. The power characterizes the physical quantity of the work. The work done in unit time is called power and is represented by P. Therefore, the power is equal to the scalar product of the force and the velocity of the force point of the object.

Physical meaning: A physical quantity that indicates how fast an object performs.

Physical definition: The power done in unit time is called power. Power is the physical quantity that indicates how fast an object does work.

What is the difference between power consumption and power?

Power consumption refers to the energy that needs to be used per unit time. For example, 1 hour is used for 1 hour, which is called power consumption.

Power refers to the energy that needs to be used instantaneously. For example, when a machine starts up, the power is 5 kW, and when it is used normally, it is 1 kW.

This is somewhat like the relationship between broadband and bandwidth:

Broadband refers to ultra-high data flow, and bandwidth refers to the specific size of mobile data.

Power consumption is real. How much energy is lost. The power is virtual. How much energy is or is needed.

Power can be divided into electric power, power of force, and the like. Therefore, the calculation formula is also different.

Electric power calculation formula: P = W / t = UI;

In the purely resistive circuit, according to Ohm's law U=IR, it can also be obtained by substituting P=UI: P=I2R=(U2)/R

In dynamics: power calculation formula: 1. P = W / t (average power) 2. P = FV; P = Fvcos α (instantaneous power)

Because W=F(F force) & TImes;S(s displacement) (the definition of work), the formula for power can also be derived from P=F·v: P=W /t=F*S/t=F*V (this formula is suitable for objects to make uniform linear motion)

P in the formula represents power, the unit is "Watt", abbreviated as "Watt", and the symbol is W.

W stands for work. The unit is "Joule", referred to as "Joule", and the symbol is J.

T represents time, the unit is "second", and the symbol is "s".

The formula for calculating electric power includes instantaneous power and average power.

That is, the instantaneous voltage and the instantaneous current are u(t), i(t), and the instantaneous power is p(t). The following equation is unconditionally established:

For periodic signals, the average value of instantaneous power in one cycle is called average power, also called active power. Active power is calculated as follows:

For a sinusoidal circuit, the following formula holds:

In the above formula, U and I are the effective values ​​of the sinusoidal alternating current, respectively, and φ is the phase difference between the voltage and the current signal.

For purely resistive circuits, such as resistance wires, bulbs, etc., φ = 0, P = UI, according to Ohm's law, the following formula holds: P = I2R = U2 / R.

The work done in unit time. In practical problems, you must not only know the work done by force, but also the time required to complete these work. So the concept of power is applied in mechanics to describe the speed of work. If the meta-function completed in time Δt is △A, the average power during this period is:

If Δt approaches zero, the instantaneous power is obtained.

The unit of power is: the international unit system and the legal unit of measurement in China are watts, that is, 1 joule per second. 1000 watts is called kilowatts.

Power consumption is generally divided into two types: dynamic power consumption from the switch, and static power consumption from leakage. The dynamic power consumption can be divided into capacitor charging and discharging (including network capacitance and input load), and the instantaneous short-circuit current formed when P/N MOS is turned on at the same time. Static power consumption can also be divided into several categories: the diffusion region and the substrate form the diode's reverse bias current (Idiode), and the other is to turn off the current through the gate oxide in the transistor (Isubthreshold). The leakage current of the chip changes with temperature, so when the chip heats up, the static power consumption index rises. In addition, the leakage current will increase as the feature size decreases.

Formula: Ptotal = Pdynamic + Pshort + Pleakage

Pswitch = A * C * V2 * F

Pshort = A (B/12) (V-2Vth)3 * F * T

Pleakage = (Idiode + Isubthreshold) * V

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